Pipe-wrench



(No Model.)

J. D. WILSON.

PIPE WRENCH.

10.527,917. Y Patented oct. 23,1894.

UNITED STATES PATENT OFFICE.

JAMES D. WILSON, OF SAN DIEGO, CALIFORNIA.

PIPE-WRENCH.

SPECIFICATION forming part of` Letters Patent No. 527,917, dated October23, 1894..

Application filed December 21, 1893. Serial No. 494,258. (No model.)

To all whom it may con/cern.-

Be it known that I, JAMES D. WILSON, a citizen of the United States ofAmerica, residing at San Diego, in the county of San Diego and State ofCalifornia, have invented certain new and useful Improvements inPipe-Wrenches, of which the following is aspecification, referencebeinghad therein to the accompanyingdrawings.

My invention relates to pipe-wrenches; and has for its object to providea wrench of this class which will accommodate itself to the unevennessand irregularities of shape and contour of the pipe operated upon, whichwill providea sure and reliable grip upon the pipe, which will not beliable to lock or jam in operation, and which shall be simple inconstruction, inexpensive in manufacture, durable in use, and efficientand serviceable in operation.

For the attainment of these objects, and for other purposes hereinafterenumerated,my improvement comprises, in brief, certain details ofconstruction, arrangement and com` bination of parts, all of which willbe more fully described hereinafter, and therspecific points of noveltyin which willbe specifically designated in the appended claim.

Referring to the accompanying drawings forming a part of thisspecification z--Figure l is a perspective View of la wrench embodyingmy invention. tion taken longitudinally through the same. Fig. 3 is adetail perspective View of the upper jaw. Fig. Lt is a similar viewbfthe bearing block; and Fig. 5 is a detail view of the guidebracket.`

In all the viewsof the drawings like letters of reference denote like orcorresponding parts.

Referring to Figs. l and 2, A designates the handle of the wrench, madepreferably of iron or other metal and of the requisite length. rIhishandle tapers slightly toward its rear free end, and at its forward endis provided with an integral segmental head, B, constituting onegripping jaw of the wrench. At the apex or upper side of the head, B, isformed a toothed segment, C, which extends a prescribed distance overthe edge of the head in the arc of a circle described from the4 Fig. 2is a vertical central secaxis of said head; and on the forward portionof this head and in Vfront of the segment, O, is formed the roughened orserrated gripping segment, D, on the convex forward end of the head, andisadapted to co operate with the correspondingly roughened portion ofthe upper jaw, more fully described hereinafter.

The upper jaw, E, is made in one piece of metal and consists of thestraight horizontal rectangular portion, F, and the integral hook shapedend, G, forming the upper gripping jaw and having the curvel" concavedside adjacent to the segment, D, ronghened or serrated to correspond tothe latter. The

under side of the horizontal portion, F, is

provided with a rack-bar, H, which engages and intermeshes with theteeth of the segment, C; and the two jaws are held together and inengagement by the bifurcated guidebracket, I, made in one piece ofmetal, and comprising the two side-brackets, a., o, and the top flatplate, b. The bracket, Lis pivotally connected with thehead, B, by thebearing-block, J, which is seated in an elongated rectangular slot, K,formed transversely through the head, B, and consists of a rectangularblock having at each end a laterally projecting stud, c, which entersand bears in a coincident bearing, opening, d, in the adjacent bracket,a; By this-construction the head, B, is axially swiveled on the studs,c,

and is pivotally connected thereby to the bracket, I. On each side ofthe portion, F, is formed a longitudinal channel or groove, e, whichengages arib or bead,f, on the adjacent inner wall of the respectivebracket, ct, whereby the upper jaw, E, is guided in its forward andbackward play.

Lindicates a thumb-screw which passes up from the under side of thehead, B, through a vertical screw-threaded bore, g, and also passesloosely through the opening, h, in the block, J, terminating in across-pin fitted to the upper terminal thereofand provided with a rigidstop at the outer face of the block to hold the screw in place in theblock. Thus, by turning the thumb-screw in either direction the bearingblock, J, is correspondingly moved in its elongated slot and the jaws,B, and E, either released from engagement or secured together. In thisway, the rack-bar and A Wrench composed of the Wrench bar havi ing thecurved serrated jaw at its outer end and the toothed segment on its rearside, and the elongated slot K opposite said segment,

the movable jaw having a straight shank toothed on the inner side tomesh with said segment and provided with the side grooves, the U shapedyoke embracing said shank and having the internal ribs i'n said grooves,substantially as described, the pivot block adjustable in said slot andto which said yoke is pivoted, and the adjusting screw, as set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

JAMES D. WILSON.

Witnesses:

W. R. SPOHN, A. M. MERCHANT.

